Showing a nude 2-3 panels of naked Joe isn't really a equivalent of stripping or using Rebecca as fan-service in nearly every chapter she is in.
The difference between guys and girls, it's when it's used on girls it's when they feel threatened or fear fort heir safety. When guys do it, it's a ˝power move˝. It's about power dynamic. When Joe appeared naked he had the upper hand in the situation, Rebecca was scared what would happen to her.
When she was kidnapped and sold as a slave? Female character when stripped, fear what could happen to them, the worst case scenario ( assault, rape or slavery) , when guys do it? Nah
They could have talked in the cafeteria ? At a table? In any other room ,but we get their first real interaction while they're naked and showering. It's it's normalto talk in the spa/shower, why don't Shiki and Weis do it?
Nobody is talking about colour-spreads, but the actual story?
You don't find it convenient that of all the things Slyph could do ,her ability allows her to strip,and her opponent is female?
She hasn't been stripped to the point of naked in this arc. Do you mean Gulist? That is plot point than being fanservice as Illegia was going to change her to real life naked statues which many statues has shown to be naked in real life like David statues for example. It's more dark than fanservice about it. I would agree if it was pointless fanservice for fanservice, but it wasn't.
It depends on that as I seen series that damage clothing and stripped girls similar to males and it's not treated to make them weak and vulnerable like Ikkitousen, Kenichi: Strongest Disciple, Tengho Tenge, etc.. Even some mainstream anime didn't deter this making them weak. Like HXH, Bleach, SDS, etc..
EZ for this series especially to Mashima aren't using it to make them vulnerable as power move as well. Rebecca didn't stop fighting once her EG torn her leg clothing and Homura not gonna stop fighting even her clothing is damaged and destroyed.
Also fanservice has make guys vulnerable before for example Weisz was naked after his battle in Sun Jewel which was used as same fashion that you would think be female, but Mashima put it on his male for it. There also Mosco being stripped by Sister for 'training' in her room. He not above making males being used in same area. He is unisex with fanservice. It been apparent. His favorite gag was FT with Gray's stripping for comical moments than power move a lot.
He doesn't have biased on females with all evidence he did to males and can be reverse on situation on genders.
If that was the case Slyph would do same to Rebecca, but didn't given reason Rebecca has bodysuit while Homura got a Kimono-like design. One is tighten to the body while other is more loose. It make sense for Wind to tear off clothes from others if you been near Hurricane and Typhoon.
It's not pointless fanservice or no sense. It's reasonable. She probably would do same to others being males too. It's not one way route he only does it to females as he would do the same to males. It's unisex and can be use both genders to make them power move or vulnerable. It's not bad with fanservice on EZ especially compare to past work which I can agree did have pointless fanservice at times, but this one is more toned down and pushing more unisex still. Just saying to you.